Tom & Lisa P wrote:
> >At 5:52 PM -0400 9/5/01, Tom & Lisa P wrote:
> >>I ran two iterations of battery amnesia for 1/2 hour. The average
> >>temp registered by the thermocouple at that time was ~52 C.
> >>
> >>Now, under the exact same conditions, but using a new heat pad
> >>replacing the apple heat pad, I ran 2 more of the same tests.
> >>
> >>This time, the average temperature was ~57 C.
> >>
> >>Now, I take this to mean that the new heat pad is better at
> >>conducting heat to the heat sink. I have already talked to another
> >>engineer, but he isnt sure my interpretation is correct.
> >
> > When you replaced the hatpad, the temperature increased 5 degrees,
> >and you think it's working BETTER?!!! Your logic escapes me completely,
> >unless it's a typo.
> >Paul
>
> The temperature of the thermocouple, which was on _top_ of the
> heatsink got hotter. Dont trust the CPU temperature readings that
> several utilities give you.
>
> If the heatsink is getting hotter, and the total amount of energy put
> out by the CPU is constant, then it stands to reason (so I say) that
> means the CPU is cooler.
>
> Mad Dog
>
Heat (energy) is not going to flow from a lower temperature to a high temperature
(exactly the opposite)- ie if the heatsink is hotter than the CPU is also hotter
-likely by more than the difference in heatsink temperatures, since the eff. is less
and therefore a higher delta is required to reach equilibrium.
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